30. ---They are quiet, aren’t they? ---Yes. They are accustomed _____ at meals.
When you hear a fire alarm, don't rush________, you should keep calm.
No matter where he is, he makes ________ a rule to go out for a walk before breakfast.
One of the characteristics that make me different from many people is my adaptability—I'm________ and comfortable in new or unusual situations.
Henry would rather his mother________ in the school where he is studying.
—I find it astonishing that your deskmate ________ be so rude to you. —Not astonishing at all. She is always rude to anyone else.